A tense exchange unfolded during a Senate Appropriations Committee hearing as DHS Secretary Markwayne Mullin responded directly to opening remarks from Sen. Chris Murphy (D-CT). Murphy criticised the administration's immigration and homeland security policies, prompting a forceful rebuttal from Mullin, who defended the Department of Homeland Security's actions and challenged claims made by the Connecticut senator.

Homeland Security Secretary Markwayne Mullin won’t guarantee that he’ll abide by the law.

Mullin got into a heated exchange with Senator Patty Murray.